This blue form of S. johannis,
more common in nature than the white form, makes a dramatic wall
planting alongside a pathway in the glasshouses of the RBGE. This
species is one of the most important of those involved in the
development of modern hybrids, and has contributed its
characteristic flower shape, as well as its floriferous nature,
to many hybrids. A photo of a single potted plant better
illustrates the nature of the plant when grown as a specimen.